Update bg locale
Revert "Put bango back as default provider on payments-alt"

This reverts commit 6fead7de4614f7aa453a0d4a5a8c19ea624d9764.
Add logout url for bango
Remove if statement, simplify tests
Put bango back as default provider on stage/prod

Regression from
https://github.com/mozilla/webpay/commit/ea1e8a5e46c75a180f5c301f5a0dcf44098ef204#diff-dd105a0d42e09344f9547443a623c831L520
Use SPA wait-to-finish conditionally (bug 1032316)
Store Persona Email in Solitude (bug 1027275)

- Set email on buyer creation
- Update email on buyer if not set after login
- Update auth views
- Update auth api
- Update tests
remove socket lookup
Explain SPA codes in error legend (bug 1036461)